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Letters Patent 1V0. 71,394, dated h ovember 26, 1857.

IMPROVEMENT IN VELOGIMETERS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDWARD A. Laws, of the city and county of St.Charles, and State of Missouri, have invented a new and usefulImprovement in Vclocimeters; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enable thoseskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming part of this specification.

This invention relates to a new and improved machine whereby thevelocity of running machinery may be measured; and the inventionconsists in an arrangement of wheels and eccentrics, which are operatedby the moving machinery in part, and in part by clock-work and coilsprings, but in such a manner that any variation in the speed of themachinery is indicated by an index-finger on a dial-plate.

The invention also consists in combining with the velocimeter a clock,which may indicate the time of day, while at the same time it exerts agoverning influence over the vclocimeter by rotating a portion of thewheels thereof, as will be hereinafter more fully described. In theaccompanying plate of drawings my invention is illustrated. Y

Figure 1 represents a view of the machinery, showing a side view of thewheels of the vclocimet-er, and the clock-work, with a portion of thedial-plate, the latter being broken away in order to expose the wheels.

Figure 2 is a top view of the machine.

Figure 3 is a view of one of the eccentrics, showing the movable rackwhich is governed by the eccentric, and which in its turn governs theindex-finger on the dial-plate.

Figure 4 is a side View of the clock-wheel of the vclocimeter, which isdriven by the clock-work.

Similar letters of reference indicate corresponding parts.

A represents the machinery of the velocimeter, and 13 the clock-work.

In describing the velocimcter it must be understood that it is composedof two sets or duplicated parts nearly throughout; two sets of wheels,two eccentrics, Ste. There are also two wheels driven by the clock,which are immediately connected with the velocimeter.

The wheel marked d, in the drawings, is driven by the clock, which makesone revolution in about thirty seconds.

c is a shaft which represents the point of connection with the runningmachinery, the speed of which is to be measured, and which is supposedto be continuously operated thereby. Upon the axle 7c are twocog-wheels. One, a, is rigidly fastened in the axle, and revolvescontinuously, it being driven by the pinion of the shaft 0. The otherwheel, a, turns loosely on the axle, and is subject to be periodicallyconnected with and released from the other wheel by a movable disk andsaw-tooth arrangement or clutch, situated between them, and seen at 0.These periods of connection and release are determined by a lever, g,which is governed by the clock-wheel d. I

The loose cog-wheel a on the axle of the wheel 0 is geared into thepinion-wheel a, and the small pinion 2 on the shaft 70 rotates the wheelm, which rotates the eceentricf.

The compound lever it t' is causedby the clock-wheel (Z to periodicallyrise and falhat i into the teeth of the wheel 0. The lever at i beingraised, and the wheels on the arle It being connected by a disk andclutch so as to movb together, upon turning crank c all the wheels willrevolve, includingthe eceentricf, which pushes the rack or red J, whichoperates' or influences the index-finger p. The disk bearing the clutche is caused to rotate with the cog-wheel a by means of a. pin projectingfrom the latter, which, pressing against a steel spring fastened to thedisk, carries it around. When the lever at 2' falls, it makes a suddenstoppage of wheel 0, together with cog-Wheel a and the eccentric f. Thiscauses the projecting pin to break over the steel spring, thus severingthe connection between cog-wheels a a. By the time that the projectingpin (by another revolution) overtakes the steel spring again, the lever9 will have separated the parts of the clutch-coupling 0, so that thedisk may revolve freely with wheel a, and yet have no effect upon wheela. So long as the lever 1' remains down, the wheels 0' and on, with theeccentric f, continue stationary, holding the index-finger to the pointat which it had arrived when the stoppage occurred. In the mean time theother cccentric,f, having performed its six seconds rotation, on theother side of the instrument, is now stopped by a similar process. Thelever at 2' is, by the action of the clock-wheel (Z, raised so as torelease the wheels 0 m, and the cccentricf, whereupon the latter iscaused, by a coil spring 12-, to return to its first position. Theindex-finger is now being held stationary by the eccentric f. The levergimmediately throws into connection the cog-wheels a a, andthc eccentricf is thus made to commence another rotation forward. When this one isagain stopped, as before, the eccentricf is released, and is returned bythe spring, and commences to rotate from its standing-point, and 30 thealternate movements are kept up as long as the crank at c isyturned bythe machinery, and the clock continues to run. i

The lever g is operated by projecting flanges on the sides of theclock-wheel d, which flanges or wings engage with the end of the leverevery six seconds, thereby operating the clutch which connects the twowheels a a.

S is a spring, which bears upon the lever 2' to force it to engage withthe cogs of the wheel 0.

The rack or lever J has a T-shaped end, which engages alternately withthe eccentric; ff, and as it is crowded forward by them the cogs on itengage with the small pinion 3 on the index-finger shaft 4.. This T-lever or rack is kept in contact with the eccentric by the spiral spring0', and it will be borne in mind that the eccentrics do not make a fullrevolution, but are brought back by the coil spring at certain periodsof time.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The use of one or more eccentrics, with intermittent rotation, regulatedby connecting clock-work and other appropriate mechanical devices, (asgear-wheels, springs, &c.,) for indicating, at repeated intervals oftime, the rate of speed of running machinery in such intervals, whilesuch machinery continues in motion In combination with a velocimeterthus constructed, I claim a clock, which may indicate the timcof day inconnection therewith, substantially as set forth.

The above specification of my invention signed by me, this 24th dayofApril, 1867.

EDWARD A. LEWIS.

Witnesses:

O. 0. R001), H. E. MENKENS.

